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4500 flatline reg seat help needed.

I have a leak and I am almost sure my reg seat is bad. sucks its a brand new tank. but I have a new reg seat and well I dont know how to take the reg seat off does the piston unscrew from the stem cause im affraid to try to force that hard little red reg seat over the end of the stem and risk ruining it or is that the only way to get it on?